Shearer has been with the long-running animated series since it began in 1989. He reportedly is walking away from $14 million for two years of work in order to continue to pursue other projects.

Aside from the Simpson family, the characters Shearer provided voices for all these years are beloved by fans. Shearer not only voiced the often antagonist Mr. Burns, but also his loyal assistant and admirer Waylon Smithers.

Shearer also voiced two former presidents in the show -- George H. W. Bush and Bill Clinton -- along with former California Gov. Arnold Schwarzenegger, who became president in the series. He even voiced Al Gore.

Showrunner Al Jean told CNN that "The Simpsons" does not plan to kill off any of Shearer's characters, but rather replace them with "the most talented members of the voice over community."

To celebrate and honor Shearer's run and legacy on the show, take a look at the gallery above for the many characters he brought life to.